module Sequel::Plugins::PgRow

  1. lib/sequel/extensions/_model_pg_row.rb
  2. lib/sequel/plugins/pg_row.rb
  3. show all

The pg_row plugin allows you to use Sequel::Model classes as composite type classes, via the pg_row extension. So if you have an address table:

DB.create_table(:address) do
  String :street
  String :city
  String :zip

and a company table with an address:

DB.create_table(:company) do
  String :name
  address :address

You can create a Sequel::Model for the address table, and load the plugin, which registers the row type:

class Address < Sequel::Model(:address)
  plugin :pg_row

Then when you select from the company table (even using a plain dataset), it will return address values as instances of Address:

# => {:name=>'MS', :address=>
#  Address.load(:street=>'123 Foo St', :city=>'Bar Town', :zip=>'12345')}

If you want a lot of your models to be used as row types, you can load the plugin into Sequel::Model itself:

Sequel::Model.plugin :pg_row

And then call register_row_type in the class


In addition to returning row-valued/composite types as instances of Sequel::Model, this also lets you use model instances in datasets when inserting, updating, and filtering:

DB[:company].insert(name: 'MS', address:
  Address.load(street: '123 Foo St', city: 'Bar Town', zip: '12345'))


Public Class

  1. configure

Public Class methods


When loading the extension, make sure the database has the pg_row extension loaded, load the custom database extensions, and automatically register the row type if the model has a dataset.

[show source]
   # File lib/sequel/plugins/pg_row.rb
54 def self.configure(model)
55   model.db.extension(:pg_row, :_model_pg_row)
56   model.register_row_type if model.instance_variable_get(:@dataset)
57 end